Improvement in the manufacture of graduated glass-ware



J. H. HOB BS. Improvement in Manufacture of Graduated Glass-Ware;

Patented Oct. 15,1872.

. m H m w O M W i 6/ MKH UNITED STATES PATENT OFFICE.

JOHN H. HOBBS, OF WHEELING, WEST VIRGINIA.

IMPROVEMENT IN THE MANUFACTURE OF GRADUATED GLASS-WARE.

Specification forming part of Letters Patent No. 132,208, dated October15, 1872.

drawing making a part of this specification,

in which- Figure l is an inside elevation of the one half of a two-partmold, with sectional view of the base and; ring and a side view of theplunger; and Fig. 2 is a side view somewhat enlarged of a graduatedglass made therein.

Like letters of reference indicate like parts in each.

My improvement relates to the manufacture of internally graduated hollowglass-ware.

To enable others skilled in the art to make and use my improvement, Iwill proceed to describe its construction and modeof operation.

At 13 I have shown one half of a two-part or jointed glass-mold,designed for pressing articles of glass-ware; or it may be considered asrepresenting, above the smallest part of its cavity, a sectional view ofa solid mold, from which the manufactured article is to be re moved atthe larger end of the cavity, since my improvement is applicable to bothjointed and solid molds. The cavity 1) is of the form of the exterior ofthe article to be made. The base D and ring D are of any convenientconstruction, and are designed for the usual purposes. The' plunger a ismade of the form which is desired to be given to the inside of thearticle to be made, and of any suitable construction, with thisaddition, that it is graduated, as at a, to any desired scale, and fromthe lower end upward to any desired distance. The operation of pressingdiffers in no respect from that ordinarily practiced. In this way Iproduce any desired kind of an open-topped article of glass-ware, one ofwhich is shown at d, with a graduation, d, on its inner face exactlycorresponding to that used on the plunger.

I am aware that it is not new to graduate the cavity of a glass-mold,and thereby produce articles of glass-Ware graduated on their outerfaces; but in such case the thickness 'of the article of glass-warethrough the bottom necessarily varies somewhat with the quantity ofmolten glass dropped into the mold, the excess, if any, over what isrequired, going into the bottom part, and the deficiency, if any, beingmade up from that which would otherwise go to form the bottom part.Hence such mode of graduation is uncertain and unreliable. In myimprovement the gradnation being in the first case on the plunger, thecorrectness of the work produced will not be affected by variations inthe quantity of glass used. If the plunger goes down deeper into themold the graduation made in the article manufactured will becorrespondingly low down, and vice versa. If the plunger be accuratelygraduated the Work produced will in every case be equally correct, andin the respect referred to perfectly uniform.

What I claim as my invention, and desire to secure by Letters Patent, is

Glass-ware graduated on its inner face, sub stantially in the manner setforth.

In testimony whereof I, the said JOHN H. HOBBS, have hereunto set myhand.

JOHN H. HOBBS.

Witnesses Guns. W. BROCKMEIER, CHAS. N. BRADY.

